Outdoor current transformer

Abstract

The application provides an outdoor current transformer and relates to the technical field of transformers. The outdoor current transformer comprises a transformer body connected by an oil storage tank, a terminal box, a ceramic sleeve and a base in sequence, and one-time wiring terminals are arranged on the two sides of the terminal box and sealing assemblies are sleeved on the circumferential sides of the one-time wiring terminals. The sealing assembly comprises a mounting seat, a first inner fixing ring, a sealing inner sleeve ring, a second inner fixing ring and an outer sleeve. The mounting seat is composed of two first semicircular rings, the first inner fixing ring is clamped on the inner side of the mounting seat, the sealing inner sleeve ring is clamped in the mounting seat, the sealing inner sleeve ring is externally provided with the second inner fixing ring and an outer sleeve composed of two fourth semicircular rings, and the mounting seat and the outer sleeve are quickly and fixedly separated without bolts through arc-shaped clamping blocks, trapezoidal clamping grooves and springs, so that the sealing inner sleeve ring is convenient to replace. The transformer guarantees outdoor insulation through multi-stage sealing, and the semicircular ring splicing and elastic clamping simplify maintenance, and solve the problems of complicated replacement and low efficiency of traditional bolt connection.

Description

Technical Field

[0001] This invention relates to the field of current transformer technology, specifically to an outdoor current transformer. Background Technology

[0002] In power systems, current transformers, as core devices for transforming voltage or current, proportionally convert high voltage and large current into low voltage and small current through the principle of electromagnetic induction, providing a safe and reliable signal source for power metering, relay protection, and monitoring and control. Outdoor current transformers are exposed to complex environments for extended periods and must simultaneously meet the requirements of stable electrical performance and reliable protection performance. Their terminals, as critical interfaces for current transmission, directly affect the insulation safety and operational stability of the equipment, thus placing extremely high demands on the tightness and durability of their sealing structure.

[0003] Primary terminals need to carry high load current during operation. Long-term operation will cause the temperature of the terminals and surrounding components to rise, accelerating the aging and hardening of the sealing rings, thereby reducing sealing performance and causing problems such as moisture and dust intrusion, affecting the insulation performance and service life of the instrument transformer. In the existing technology, the sealing rings and related fixing components are mostly fixed by bolts. Replacing the sealing ring requires disassembling the bolts one by one, which is a cumbersome operation. Especially in outdoor high-altitude operation scenarios, it is not only time-consuming and labor-intensive, but also increases the operation risk, making it difficult to meet the actual needs of rapid maintenance.

[0004] To address this, we have developed a new type of outdoor current transformer. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an outdoor current transformer that solves the problem of cumbersome replacement of sealing rings and low maintenance efficiency caused by bolted connections in the primary terminal sealing structure.

[0006] (II) Technical Solution To achieve the above objectives, the present invention is implemented through the following technical solution: an outdoor current transformer, comprising a transformer body, the transformer body comprising an oil tank, a junction box, a ceramic bushing and a base fixedly connected in sequence from top to bottom, a primary terminal being inserted through on both opposite outer sides of the junction box, and a sealing component being fixedly installed on both opposite outer sides of the junction box, the two sealing components being respectively sleeved on the periphery of the two primary terminals. Preferably, the sealing assembly includes a mounting base fixedly installed on one outer side of the junction box. The mounting base is composed of two symmetrical first semicircular rings. Each end face of the two first semicircular rings is provided with a connecting hole. A bolt is threaded into the two connecting holes that meet each other. Multiple sets of mounting holes are provided through the other end face of the mounting base. A sealing groove is provided on one side of the mounting base, and a sealing ring is embedded in the sealing groove.

[0007] Preferably, the mounting base has a first inner fixing ring that is snapped into place inside, and a sealing inner sleeve that is snapped into place inside the first inner fixing ring, and the sealing inner sleeve is fitted onto the peripheral side of the primary terminal block.

[0008] Preferably, the circumferential side of the sealing inner ring is fitted with a second inner fixing ring that fits against the first inner fixing ring, and the circumferential side of the second inner fixing ring is fitted with an outer sleeve that fits against the mounting base.

[0009] Preferably, both the first inner fixing ring and the second inner fixing ring are composed of two second semi-circular rings, and both the first inner fixing ring and the second inner fixing ring have trapezoidal grooves inside that fit with the sealing inner ring.

[0010] Preferably, the sealing inner ring is composed of two mutually interlocking third semicircular rings. One of the third semicircular rings has an insertion groove on both ends, and the other third semicircular ring has a connector fixed on both ends to interlock with the insertion groove.

[0011] Preferably, the mounting base has several movable grooves on one side, and two through holes are formed through the inner wall of the mounting base. The outer sleeve is composed of two fourth semi-circular rings. Several first trapezoidal slots are formed on one end face of the outer sleeve. The several first trapezoidal slots are evenly distributed on the two fourth semi-circular rings. The first trapezoidal slots are connected to the movable grooves. Several second trapezoidal slots are formed on one end face of the mounting base. The several second trapezoidal slots are connected to the several first trapezoidal slots one by one.

[0012] Preferably, an arc-shaped locking block is slidably fitted inside the movable groove, and the side cross-section of the arc-shaped locking block is L-shaped.

[0013] Preferably, two connecting rods are fixed to the outer wall of the arc-shaped block. The connecting rods slide through the through hole. A spring located inside the movable groove is sleeved on the circumferential side of the connecting rod. A pull block is fixedly connected to one end of the two connecting rods that passes through the inner wall of the mounting base.

[0014] Preferably, an iron core is fixedly installed inside the base, a primary winding is fixedly connected to the top of the iron core, a secondary winding is sleeved on the periphery of the iron core, and a junction box electrically connected to the secondary winding is fixedly installed on the outer periphery of the base.

[0015] (III) Beneficial Effects This invention provides an outdoor current transformer, which has the following advantages: This outdoor current transformer employs a multi-stage sealing design. The mounting base's sealing ring achieves surface sealing, while the inner sealing ring, through elastic deformation, tightly fits with the primary terminal to form a radial seal. The trapezoidal grooves of the first and second inner fixing rings further enhance the sealing effect, and the outer casing forms an outer layer of protection, blocking moisture and dust intrusion from multiple dimensions and ensuring the transformer's insulation performance in complex outdoor environments. Simultaneously, the semi-circular ring splicing structure of the sealing assembly, along with the coordinated design of the arc-shaped locking block and trapezoidal groove, allows for the replacement of the inner sealing ring without removing bolts; it can be completed simply by rotating the outer casing and pulling the locking block. This significantly simplifies the maintenance process, improves outdoor work efficiency, and balances protective reliability with ease of operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional schematic diagram of the present invention; Figure 3 This is a schematic diagram of the sealing assembly. Figure 4 A cross-sectional view showing the sealing assembly engaging the arc-shaped locking block into the first trapezoidal slot. Figure 5 The sealing assembly is positioned so that the arc-shaped locking block engages with the second trapezoidal slot, resulting in a cross-sectional view; Figure 6 Exploded view of the inner sealing ring; Figure 7 This is a structural diagram of the snap-fit ​​connector; Figure 8 This is an exploded view of the sealing assembly.

[0017] The components are as follows: 1. Current transformer body; 2. Oil conservator; 3. Junction box; 4. Ceramic bushing; 5. Base; 6. Primary terminal; 7. Sealing assembly; 8. Mounting base; 9. First semi-circular ring; 10. Connecting hole; 11. Mounting hole; 12. Sealing groove; 13. Sealing ring; 14. First inner fixing ring; 15. Sealing inner ring; 16. Second inner fixing ring; 17. Outer assembly; 18. Second semi-circular ring; 19. Trapezoidal groove; 20. Third semi-circular ring; 21. Plug groove; 22. Connector; 23. Movable groove; 24. Through hole; 25. First trapezoidal slot; 26. Second trapezoidal slot; 27. Arc-shaped locking block; 28. Connecting rod; 29. ​​Spring; 30. Pull block; 31. Iron core; 32. Primary winding; 33. Secondary winding; 34. Secondary junction box; 35. Fourth semi-circular ring. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Examples, such as Figure 1 - Figure 8 As shown, this embodiment of the invention provides an outdoor current transformer, including a transformer body 1. The transformer body 1 includes an oil conservator 2, a junction box 3, a ceramic bushing 4, and a base 5, which are fixedly connected vertically. Primary terminals 6 are inserted through each of the two opposite outer sides of the junction box 3. Sealing components 7 are fixedly installed on each of the two opposite outer sides of the junction box 3. The two sealing components 7 are respectively sleeved on the periphery of the two primary terminals 6. The overall structural framework of the transformer is formed by the layered fixing of the oil conservator 2, junction box 3, ceramic bushing 4, and base 5. The primary terminals 6 serve as current transmission interfaces, and the sealing components 7 on their periphery are used to prevent external moisture and dust from entering the interior of the junction box 3, thus avoiding a decrease in insulation performance.

[0020] Specifically, the sealing assembly 7 includes a mounting base 8 fixedly installed on one outer side of the junction box 3. The mounting base 8 is composed of two symmetrical first semicircular rings 9. Each end face of the two first semicircular rings 9 is provided with a connecting hole 10. The two connecting holes 10 that meet each other are threaded with a bolt. Multiple sets of mounting holes 11 are provided through the other end face of the mounting base 8. A sealing groove 12 is provided on one side of the mounting base 8. A sealing ring 13 is embedded in the sealing groove 12. The mounting holes 11 are used to fix the mounting base 8 on the junction box 3 to ensure the stability of the sealing assembly 7. The sealing groove 12 and the sealing ring 13 cooperate to achieve a surface seal between the mounting base 8 and the junction box 3, preventing fluid from leaking from the contact surface. The mounting base 8 has a first inner fixing ring 14 that is snapped in, and a sealing inner ring 15 that is snapped in. The sealing inner ring 15 is sleeved on the circumferential side of the primary terminal 6. The sealing inner ring 15 is fixed by the first inner fixing ring 14 through snapping, so that the sealing inner ring 15 fits tightly against the circumferential side of the primary terminal 6. The elastic deformation of the sealing inner ring 15 fills the gap, thereby achieving radial sealing. The inner sealing ring 15 is fitted with a second inner fixing ring 16 that fits against the first inner fixing ring 14. The second inner fixing ring 16 is fitted with an outer sleeve 17 that fits against the mounting base 8. The second inner fixing ring 16 and the first inner fixing ring 14 together clamp the inner sealing ring 15, enhancing the tightness of the fit between the inner sealing ring 15 and the primary terminal 6 and improving the sealing effect. The outer sleeve 17 covers the joint between the second inner fixing ring 16 and the mounting base 8, forming an outer protective layer to further prevent impurities from entering. The first inner fixing ring 14 and the second inner fixing ring 16 are both composed of two second semi-circular rings 18. The first inner fixing ring 14 and the second inner fixing ring 16 are both provided with trapezoidal grooves 19 that fit with the sealing inner ring 15. The semi-circular ring structure allows the first inner fixing ring 14 and the second inner fixing ring 16 to be fitted into the sealing inner ring 15 from the side without having to pass through the primary terminal 6 axially, thus simplifying the installation process. The inclined surface of the trapezoidal groove 19 matches the outer circumferential contour of the sealing inner ring 15, which enhances the sealing performance of the sealing inner ring 15 through radial compression, while limiting its axial displacement. The sealing inner ring 15 is composed of two interlocking third semi-circular rings 20. Each of the two ends of one third semi-circular ring 20 is provided with an insertion groove 21, and each of the two ends of the other third semi-circular ring 20 is fixed with a connector 22 that interlocks with the insertion groove 21. The two third semi-circular rings 20 are spliced ​​together by the interlocking of the insertion groove 21 and the connector 22 to form a complete sealing inner ring 15. The mounting base 8 has several movable grooves 23 on one side, and two through holes 24 through the inner wall of the mounting base 8. The outer sleeve 17 is composed of two fourth semicircular rings 35. The outer sleeve 17 has several first trapezoidal slots 25 on one end face, which are evenly distributed on the two fourth semicircular rings 35. The first trapezoidal slots 25 are connected to the movable grooves 23. The mounting base 8 has several second trapezoidal slots 26 on one end face, which are connected to the first trapezoidal slots 25 one by one. The movable grooves 23 provide sliding space for the arc-shaped locking block 27, and the through holes 24 provide a moving channel for the connecting rod 28. The outer sleeve 17 adopts a semicircular ring structure, which can be inserted and spliced ​​from the side. With the connection design of the first trapezoidal slots 25 and the second trapezoidal slots 26, it provides a locking path for the arc-shaped locking block 27, realizing the quick fixation of the outer sleeve 17 and the mounting base 8 without bolts. An arc-shaped locking block 27 is slidably fitted inside the movable groove 23. The side cross-section of the arc-shaped locking block 27 is L-shaped. The horizontal section of the L-shaped arc-shaped locking block 27 can be locked into the first trapezoidal locking groove 25 or the second trapezoidal locking groove 26 to achieve circumferential fixation between the outer component 17 and the mounting base 8. The sliding fit allows the arc-shaped locking block 27 to extend and retract according to the rotation state of the outer component 17, adapting to the needs of locking and separating. Two connecting rods 28 are fixed to the outer wall of the arc-shaped locking block 27. The connecting rods 28 slide through the through hole 24. A spring 29 located inside the movable groove 23 is sleeved on the circumferential side of the connecting rods 28. The two connecting rods 28 are fixedly connected to a pull block 30 at one end that passes through the inner wall of the mounting base 8. The connecting rods 28 connect the arc-shaped locking block 27 and the pull block 30. By pulling the pull block 30, the arc-shaped locking block 27 can be retracted synchronously, which facilitates the disassembly of the outer kit 17. The elastic force of the spring 29 pushes the arc-shaped locking block 27 to reset, ensuring that it is stably locked into the trapezoidal slot when there is no external force, realizing the automatic locking of the outer kit 17. The through sliding fit ensures that the connecting rods 28 move smoothly and avoid jamming. An iron core 31 is fixedly installed inside the base 5. A primary winding 32 is fixedly connected to the top of the iron core 31, and a secondary winding 33 is sleeved on the side of the iron core 31. A secondary junction box 34, which is electrically connected to the secondary winding 33, is fixedly installed on the outer side of the base 5. The iron core 31 serves as the core of the magnetic circuit, realizing the electromagnetic induction coupling between the primary winding 32 and the secondary winding 33, and completing the current / voltage ratio conversion. The secondary junction box 34 provides a wiring interface for the secondary winding 33, facilitating connection with external equipment. The base 5 provides support and protection for the internal components.

[0021] Working principle: The replacement process of the inner sealing ring 15 relies on the cooperation between the arc-shaped locking block 27 and the trapezoidal locking groove to achieve efficient operation: When replacement is required, first rotate the outer assembly 17 to make the arc-shaped locking block 27, which was originally locked in the second trapezoidal locking groove 26, slide back to the first trapezoidal locking groove 25; then pull the pull block 30, which drives the arc-shaped locking block 27 to further compress the spring 29 through the connecting rod 28, so that the arc-shaped locking block 27 is completely disengaged from the first trapezoidal locking groove 25. At this time, the fixation between the outer assembly 17 and the mounting base 8 is completely released; the outer assembly 17, which is composed of two fourth semi-circular rings 35, can be disassembled; then the second inner fixing ring 16 and the first inner fixing ring 14 of the semi-circular ring structure are removed in sequence; the inner sealing ring 15, which is formed by the insertion of two third semi-circular rings 20, is separated and replaced. Installation is performed in reverse order: After splicing the new inner sealing ring 15, place it onto the primary terminal 6; then assemble the first inner fixing ring 14, the second inner fixing ring 16, and the outer fitting 17 in sequence; rotate the outer fitting 17 to allow the arc-shaped locking block 27 to slide from the first trapezoidal slot 25 to the second trapezoidal slot 26 under the elastic force of the spring 29 and lock in place, thus completing the fixation. This design, through the steps of first rotating the outer fitting 17 to reset the arc-shaped locking block 27 and then pulling the pull block 30 to completely unlock it, combined with the semi-circular ring splicing structure, achieves the advantage of quickly replacing the inner sealing ring 15 without removing the bolts, ensuring sealing reliability and significantly improving outdoor maintenance efficiency.

[0022] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An outdoor current transformer, comprising a transformer body (1), wherein the transformer body (1) comprises an oil conservator (2), a junction box (3), a ceramic bushing (4), and a base (5) fixedly connected vertically, characterized in that: The junction box (3) has primary terminals (6) inserted through on both of its outer sides. The junction box (3) has sealing components (7) fixedly installed on both of its outer sides. The two sealing components (7) are respectively sleeved on the sides of the two primary terminals (6). The sealing assembly (7) includes a mounting base (8) fixedly installed on one outer side of the junction box (3). The mounting base (8) is composed of two symmetrical first semicircular rings (9). One end face of each of the two first semicircular rings (9) is provided with a connecting hole (10). The two connecting holes (10) that are mated together are connected with a bolt by a common thread. The other end face of the mounting base (8) is provided with multiple sets of mounting holes (11). One side of the mounting base (8) is provided with a sealing groove (12). A sealing ring (13) is embedded in the sealing groove (12). The mounting base (8) is fitted with a first inner fixing ring (14), and the first inner fixing ring (14) is fitted with a sealing inner sleeve (15). The sealing inner sleeve (15) is sleeved on the circumferential side of the primary terminal (6). The sealing inner ring (15) is fitted with a second inner fixing ring (16) that fits against the first inner fixing ring (14), and the second inner fixing ring (16) is fitted with an outer sleeve (17) that fits against the mounting base (8). The mounting base (8) has several movable grooves (23) on one side, and two through holes (24) are opened through the inner wall of the mounting base (8). The outer sleeve (17) is composed of two fourth semicircular rings (35). The outer sleeve (17) has several first trapezoidal slots (25) on one end face. The several first trapezoidal slots (25) are evenly distributed on the two fourth semicircular rings (35). The first trapezoidal slots (25) are connected to the movable grooves (23). The mounting base (8) has several second trapezoidal slots (26) on the other end face. The several second trapezoidal slots (26) are connected to the several first trapezoidal slots (25) one by one. An arc-shaped locking block (27) is slidably fitted inside the movable groove (23), and the side cross-section of the arc-shaped locking block (27) is L-shaped; Two connecting rods (28) are fixed on the outer wall of the arc-shaped card block (27). The connecting rods (28) slide through the through hole (24). A spring (29) located inside the movable groove (23) is sleeved on the periphery of the connecting rods (28). A pull block (30) is fixedly connected to one end of the two connecting rods (28) that passes through the inner wall of the mounting base (8).

2. An outdoor current transformer according to claim 1, characterized in that, The first inner fixing ring (14) and the second inner fixing ring (16) are both composed of two second semi-circular rings (18). The first inner fixing ring (14) and the second inner fixing ring (16) are both provided with trapezoidal grooves (19) that fit with the sealing inner ring (15).

3. An outdoor current transformer according to claim 2, characterized in that, The sealing inner ring (15) is composed of two interlocking third semicircular rings (20). One of the third semicircular rings (20) has an insertion groove (21) on both ends, and the other third semicircular ring (20) has a connector (22) fixed on both ends to interlock with the insertion groove (21).

4. An outdoor current transformer according to claim 3, characterized in that, The base (5) has an iron core (31) fixedly installed inside. A primary winding (32) is fixedly connected to the top of the iron core (31). A secondary winding (33) is sleeved on the periphery of the iron core (31). A secondary junction box (34) electrically connected to the secondary winding (33) is fixedly installed on the outer periphery of the base (5).

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